Permanently means in a way that is meant to last for good. Permanently closed, permanently damaged, permanently employed.
It claims more than it can always deliver — permanently closed businesses reopen and permanent staff are made redundant — so the word describes intention as much as outcome. The Latin permanere means to remain throughout.
1adverbpermanentlyIn a way meant to last for good.
“After the accident, he was permanently blind in one eye.”
permanently is a duration.
Permanent plus -ly, from Latin permanens, from permanere, to stay through — per, through, plus manere, to remain.
Middle English
permanently
English, today
permanently
From Middle English permanently; equivalent to permanent + -ly.
Etymology from Wiktionary, CC BY-SA